I have a parser (FIT binary data format) that I've written a handful of times, probably 9 or 10 at this point. I find that file parsers usually provide a decent

I have a parser (FIT binary data format) that I've written a handful of times, probably 9 or 10 at this point. I find that file parsers usually provide a decent tour of the language, it's standard library, and sometimes it's ecosystem. Takes a day or three. For comparisons sake, my first go at it was in C and it took a month.